Glycosyltransferase UGT76F1 is involved in the temperature-mediated petiole elongation and the BR-mediated hypocotyl growth in Arabidopsis.

The signaling network formed by external environmental signals and endogenous hormone signals is an important basis for the adaptive growth of plants. We recently identified a UDP-glucosyltransferase gene, UGT76F1, which controls the glucosylation of auxin precursor IPyA and mediates light-temperature signaling to regulate auxin-dependent hypocotyl elongation in Arabidopsis. However, it is unclear whether UGT76F1 is involved in the adaptive growth of other tissues and whether it is related to the signaling of other hormones besides auxin. Here we investigated the petiole elongation of UGT76F1 overexpression lines and knockout mutant lines, and also studied the effects of UGT76F1 on BR signaling. Experimental results indicated that UGT76F1 is involved in the PIF4-mediated petiole growth under high temperature and that UGT76F1 is also related to the BR signaling in controlling hypocotyl growth. These results suggest that UGT76F1 may have a wider significance in the plant adaptations to surrounding environments.